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A waveguide overloaded cavity as longitudinal kicker for the DA{Phi}NE bunch-by-bunch feedback system

Abstract

The multibunch operation of DA{Phi}NE calls for a very efficient feedback system to damp the coupled-bunch longitudinal instabilities. A collaboration program among SLAC, LBL and LNF laboratories on this subject led to the development of a time domain, digital system based on digital signal processors that has been already successfully tested at ALS. The feedback chain ends with the longitudinal kicker, an electromagnetic structure capable of transferring the proper energy correction to each bunch. A cavity kicker for the DA{Phi}NE bunch-by-bunch longitudinal feedback system based on a pill-box loaded by six waveguides has been designed and a full-scale aluminium prototype has been fabricated at LNF. Both simulations and measurements have shown a peak shunt impedance of about 750 ohm and a bandwidth of about 220 MHz. The large shunt impedance allows to economize on the costly feedback power. Moreover, the damping waveguides drastically reduce the device HOM longitudinal and transverse impedances. One cavity pre ring will be sufficient to operate the machine up to 30 bunches while a second device per ring together with a feedback power improvement will be necessary to reach the ultimate current. (G.T.)
Authors:
Gallo, A; Boni, R; Ghigo, A; Marcellini, F; Serio, M; Zobov, M [1] 
  1. Instituto Nazionale de Fisica Nucleare, Frascati (Italy). Lab. Nazionale di Frascati
Publication Date:
Aug 01, 1996
Product Type:
Conference
Report Number:
KEK-PROC-96-6; CONF-9506279-
Reference Number:
SCA: 430400; PA: JPN-97:003249; EDB-97:062619; SN: 97001772822
Resource Relation:
Conference: CEIBA95: international workshop on collective effects and impedance for B-factories, Tsukuba (Japan), 12-17 Jun 1995; Other Information: PBD: Aug 1996; Related Information: Is Part Of Proceedings of the international workshop on collective effects and impedance for B-factories (CEIBA95); Chin, Yongho [ed.]; PB: 531 p.
Subject:
43 PARTICLE ACCELERATORS; STORAGE RINGS; INSTABILITY; BEAM BUNCHING; FEEDBACK; DAMPING; OSCILLATION MODES; WAVEGUIDES; CAVITY RESONATORS; ELECTRIC IMPEDANCE; MESON FACTORIES
OSTI ID:
461193
Research Organizations:
National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE97729548; TRN: JP9703249
Availability:
OSTI as DE97729548
Submitting Site:
JPN
Size:
pp. 481-495
Announcement Date:

Citation Formats

Gallo, A, Boni, R, Ghigo, A, Marcellini, F, Serio, M, and Zobov, M. A waveguide overloaded cavity as longitudinal kicker for the DA{Phi}NE bunch-by-bunch feedback system. Japan: N. p., 1996. Web.
Gallo, A, Boni, R, Ghigo, A, Marcellini, F, Serio, M, & Zobov, M. A waveguide overloaded cavity as longitudinal kicker for the DA{Phi}NE bunch-by-bunch feedback system. Japan.
Gallo, A, Boni, R, Ghigo, A, Marcellini, F, Serio, M, and Zobov, M. 1996. "A waveguide overloaded cavity as longitudinal kicker for the DA{Phi}NE bunch-by-bunch feedback system." Japan.
@misc{etde_461193,
title = {A waveguide overloaded cavity as longitudinal kicker for the DA{Phi}NE bunch-by-bunch feedback system}
author = {Gallo, A, Boni, R, Ghigo, A, Marcellini, F, Serio, M, and Zobov, M}
abstractNote = {The multibunch operation of DA{Phi}NE calls for a very efficient feedback system to damp the coupled-bunch longitudinal instabilities. A collaboration program among SLAC, LBL and LNF laboratories on this subject led to the development of a time domain, digital system based on digital signal processors that has been already successfully tested at ALS. The feedback chain ends with the longitudinal kicker, an electromagnetic structure capable of transferring the proper energy correction to each bunch. A cavity kicker for the DA{Phi}NE bunch-by-bunch longitudinal feedback system based on a pill-box loaded by six waveguides has been designed and a full-scale aluminium prototype has been fabricated at LNF. Both simulations and measurements have shown a peak shunt impedance of about 750 ohm and a bandwidth of about 220 MHz. The large shunt impedance allows to economize on the costly feedback power. Moreover, the damping waveguides drastically reduce the device HOM longitudinal and transverse impedances. One cavity pre ring will be sufficient to operate the machine up to 30 bunches while a second device per ring together with a feedback power improvement will be necessary to reach the ultimate current. (G.T.)}
place = {Japan}
year = {1996}
month = {Aug}
}